linux-kernel - Re: [PATCH] ARM: l2c: prima2: only call l2x0_of

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Date:	Tue, 29 Apr 2014 23:10:57 +0800
From:	Barry Song <baohua@...nel.org>
To:	Matt Porter <mporter@...aro.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Kevin Hilman <khilman@...aro.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: l2c: prima2: only call l2x0_of_init() on matching nodes

2014-04-28 21:40 GMT+08:00 Matt Porter <mporter@...aro.org>:
> On Mon, Apr 28, 2014 at 10:15:33AM +0100, Russell King wrote:
>> On Sun, Apr 27, 2014 at 08:27:40PM -0400, Matt Porter wrote:
>> > l2x0_of_init() is executed unconditionally within the sirfsoc_l2x0_init()
>> > early initcall. In a multi v7 kernel this causes bcm281xx and bcm21664
>> > platform to fail boot since they have their own pre l2x0 init sequence
>> > that is required. Fix this by checking that a matching OF ID is present
>> > before calling l2x0_of_init().
>> >
>> > Reported-by: Kevin Hilman <khilman@...aro.org>
>> > Signed-off-by: Matt Porter <mporter@...aro.org>
>> > ---
>> > Applies against next-20140424 to fix the issue introduced in
>> > 50655e6 ARM: l2c: prima2: remove cache size override
>>
>> Err, this only "fixes" it because it effectively disables the L2 cache
>> _entirely_ - in the above commit, I kill your private compatible strings.
>>
>> This doesn't make sense.  If the cache is already enabled, then the L2C
>> code won't try to enable it again.
>
> Ok, please suggest an alternative. You merged this commit..it looks like
> it had no ack from the platform maintainer..and I don't have hardware.
> The commit is wrong, we can't have every platform executing sirfsoc's
> l2x0_of_init() call/parameters by having this stuff in an early initcall
> like that.
>
> It would be pretty straightforward to add those private compatibles
> back so the approach works. If not, we need to move this to
> .init_machine where it's guaranteed to only run on sirfsoc.

these has been one V1 patch at
http://permalink.gmane.org/gmane.linux.ports.arm.kernel/316312
my v2 has moved to init_irq() as Russell's suggestion.

>
> -Matt

-barry
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